Making autocomplete case-insensitive - objective-c

Question

I'm implementing an autocomplete in cocoa for an OSX application and thus far I've got it all pinned down. The one hangup is that the autocomplete is case-sensitive and that's not really what I want/need. Ideally the autocomplete will be case INSENSITIVE. Relevant code below:
#implementation autocompleteController
- (void)viewDidLoad {
[super viewDidLoad];
self.textField.delegate = self;
}
-(void)controlTextDidChange:(NSNotification *)obj{
NSTextView * fieldEditor = [[obj userInfo] objectForKey:#"NSFieldEditor"];
if (self.isAutocompleting == NO && !self.backspaceKey) {
self.isAutocompleting = YES;
self.lastEntry = [[[fieldEditor string] capitalizedString] copy];
[fieldEditor complete:nil];
self.isAutocompleting = NO;
}
if (self.backspaceKey) {
self.backspaceKey = NO;
}
}
-(NSArray *)control:(NSControl *)control textView:(NSTextView *)textView completions:(NSArray *)words forPartialWordRange:(NSRange)charRange indexOfSelectedItem:(NSInteger *)index{
NSMutableArray * suggestions = [NSMutableArray array];
NSArray * possibleStrings = #[#"TEST", #"ABC", #"abc", #"amauroy", #"AMA", #"amazing"];
if (!self.lastEntry || !possibleStrings) {
return nil;
}
for (NSString * string in possibleStrings) {
if ([string hasPrefix:self.lastEntry]) {
[suggestions addObject:string];
}
}
return suggestions;
}
-(BOOL)control:(NSControl *)control textView:(NSTextView *)textView doCommandBySelector:(SEL)commandSelector{
if (commandSelector == #selector(deleteBackward:)) {
self.backspaceKey = YES;
}
return NO;
}
#end

Answer 1

As Pro Blaster points out, the problem is with the following line:
if ([string hasPrefix:self.lastEntry]) {
Your autocompletion is case-sensitive because -hasPrefix: is case-sensitive. One approach is to convert everything to lower case (upper case would also work, of course). Another is to write a case-insensitive version of -hasPrefix: and add it to NSString using a category, like this:
#interface NSString (autocomplete)
- (BOOL)hasPrefixIgnoringCase:(NSString*)aString;
#end;
#implementation NSString (autocomplete)
- (BOOL)hasPrefixIgnoringCase:(NSString*)aString
{
NSRange *prefix = [self rangeOfString:aString options:NSCaseInsensitiveSearch];
return prefix.location == 0 && prefix.length == aString.length;
}
#end
Then use that method in your code:
if ([string hasPrefixIgnoringCase:self.lastEntry]) {
Note: The provided code is untested. The concept is sound, but you may find a syntax error or two.

Answer 2

I did this once.
You would do so by replacing :
for (NSString * string in possibleStrings) {
if ([string hasPrefix:self.lastEntry]) {
[suggestions addObject:string];
}
}
return suggestions
with:
for (NSString * string in possibleStrings) {
if ([[string lowercaseString] hasPrefix:[self.lastEntry lowercaseString]]) {
[suggestions addObject:string];
}
}
return suggestions;